Texas Instruments TI-84 User Manual
Page 279
Chapter 12: Statistics
276
Since the scatter plot of time-versus-length data appears to be approximately linear, fit a
line to the data.
10. Press
… ~
4
to select
4:LinReg(ax+b)
(linear
regression model) from the
STAT CALC
menu.
LinReg(ax+b)
is pasted to the home screen.
11. Press
y d ¢ y e ¢. Press ~
1
to
display the
VARS Y-VARS FUNCTION
secondary
menu, and then press
1
to select
1:Y1
.
L1
,
L2
, and
Y1
are pasted to the home screen as arguments to
LinReg(ax+b)
.
12. Press
Í to execute
LinReg(ax+b)
. The linear
regression for the data in
L1
and
L2
is calculated.
Values for
a
and
b
are displayed on the home
screen. The linear regression equation is stored in
Y1
. Residuals are calculated and stored
automatically in the list name
RESID
, which
becomes an item on the
LIST NAMES
menu.
13. Press
s. The regression line and the scatter
plot are displayed.